Re: GOST 28147-89 CFB && padding issue

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Yeah, the XML Enc spec has a non-standard padding for AES/DES and
this is the reason for this code.

I would much prefer to add a flag customPadding to the struct
_xmlSecOpenSSLEvpBlockCipherCtx that would determine this and then
set this flag from the xmlSecOpenSSLEvpBlockCipherInitialize()
function. This is much cleaner.

Thanks,

Aleksey

On 3/10/15 12:13 PM, Nikolay Shaplov wrote:
> 
> I've succsessuflly implemented GOST 28147-89 symmetric transform.
> You can see alpha version of a patch.
> 
> I think i will add cfb suffix to all transform names, as gost98
> works by default in cfb mode. And this mode is recommended. (cbc
> even has only custom implementation as it is out of standard)
> 
> I also met an issue I'd like to discuss...
> 
> cfb mode do not need padding. And for AES and DES encryption some
> strange efforts are made in openssl/ciphers.c in functions
> 
> xmlSecOpenSSLEvpBlockCipherCtxUpdate 
> xmlSecOpenSSLEvpBlockCipherCtxFinal
> 
> So I've wrapped all padding code in
> 
> if ((xmlSecKeyDataId*) ctx->keyId != (xmlSecKeyDataId*) 
> xmlSecOpenSSLKeyDataGost28147_89Id)
> 
> and everything work well now.
> 
> I am not sure that it is the best way to do the trick... If this
> way is good enough I will indent code in proper way there. If not,
>  tell me what way to use...
> 
> 
> 
> _______________________________________________ xmlsec mailing
> list [email protected] 
> http://www.aleksey.com/mailman/listinfo/xmlsec
> 
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